Hey, I will!
Found this book about Fern biotechnology that is available for free via Research Gate, you may like it :D
Sal
joined 3 years ago
MODERATOR OF
Thank you and thank you!
A fern vine! From the photo I would not have guessed that it is a fern, that's very cool.
the entire “vine” is just one gigantic leaf stretching from the forest floor to the tree canopy.
At the same time pinnae form on the leaf stalk (rachis). Pinnae look a bit like normal plant leaves but they are actually just leaf segments. The pinnae provide the energy for the frond to grow even longer.
This I find surprising from looking at the photo! I am going to need to do some reading on ferns.
Found a photos of ferns that I took during a visit to Cascadas Tulimán, in Puebla, Mexico, back in 2022.
Here is the biome:
I never got to identifying them, so any any input on potential IDs is welcome!
Ah! Great observational skills then!
Teach me a new tongue twister
Nice! Did you intentionally create this magnificent fern stack, or did it emerge from a fortunate accident?
Very lucky indeed!!! I am jealous!!
Glad you like it :D
The ping is very useful. I know that there is a built-in range test, but sometimes I don't need the test to be on all the time, nor do I want to set the frequency too high. Actually.... This give me an idea, I can simply program a command to turn the range test off/on remotely.
That weather function is nice! The US makes available some nice weather APIs. I have a PinePhone and it has a weather module that relies on a US-based API, but I am not in the US. At least I can find out the weather in Oregon easily. I don't know if there is some similar API in the Netherlands.
Im guessing you were a C/C# dev based on the function names.
I helped re-factor some C++-based micro-controller firmware recently and the original code was not following any convention, so I looked at a list of conventions and decided that 'lower camel case' looked like a nice one to pick. So, I have been developing a habit to stick to that. I do scientific r&d and only sometimes need to do a bit of programming, so I'm not sure if I'd call myself a dev!
For sure. It is quite basic and I am not proud of the hacky method I used to "parse" the message, but it might be useful for someone looking for a simple way to interface with a meshtastic device over TCP (onReceive) and the Lemmy API (createPost).
import json
import re
import meshtastic
import meshtastic.tcp_interface
from pubsub import pub
import time
import os
import requests
INSTANCE_API = "https://mander.xyz/api/v3"
MESHTEST_LEMMY_JWT = 'Cookie retrieved from browser'
def createPost(community_name, subject, body):
url = f"{INSTANCE_API}/post"
getCommunity = requests.get(f"{INSTANCE_API}/community?name={community_name}").json()
communityId = getCommunity['community_view']['community']['id']
data = {
"community_id": communityId,
"name": subject,
"body": body}
headers = {
"Authorization": f"Bearer {MESHTEST_LEMMY_JWT}",
"Content-Type": "application/json"
}
response = requests.post(url, headers=headers, json=data)
return response
MESHTASTIC_NODE_IP = "Local IP of the base node connected to WiFi"
def sstrip(text):
return re.sub(r'(?:\s|,)*(sub|SUB|Sub|COM|com|Com|Bod|bod|BOD)(?:\s|,)*$', '', text.strip())
def processMessage(message):
blocks = message.split(':') # Splits the message into blocks, but will also split smiley faces ":)", bad method.
try:
for i in range(0,len(blocks)-1):
if blocks[i][-3:].lower() == 'sub':
subject = sstrip(blocks[i+1])
if blocks[i][-3:].lower() == 'com':
community_name = sstrip(blocks[i+1]).lower()
if blocks[i][-3:].lower() == 'bod':
body = sstrip(blocks[i+1])
return community_name, subject, body
except:
return 'ERR','ERR','ERR'
def onReceive(packet, interface):
if 'decoded' in packet and 'payload' in packet['decoded']:
try:
message = packet['decoded']['payload'].decode('utf-8')
sender = packet['from']
if 'Ping' in message:
interface.sendText("Pong!", destinationId=sender)
if message.split('\n')[0] == 'PST':
try:
community_name, subject, body = processMessage(message)
response = createPost(community_name, subject, body)
if response.ok:
interface.sendText("Post created succesfully!", destinationId=sender)
else:
interface.sendText("Unable to create post!", destinationId=sender)
except:
interface.sendText("Exception triggered", destinationId=sender)
except Exception as e:
pass
interface = meshtastic.tcp_interface.TCPInterface(hostname=MESHTASTIC_NODE_IP)
pub.subscribe(onReceive, "meshtastic.receive")
while True:
time.sleep(2)
It took 3 walks to the park due to bugs and unhandled exceptions but it worked!
The python script connects to a node that is left at home. The bot can detect and process a message with the following format:
PST
Com: Meshtastic
Sub: Posting via Meshtastic
Bod: Made a python script to create posts via meshtastic messages. If you can see this, the test worked! Posting from the park with no mobile data ^_^
It will parse the message and create a post. So, as long as I can reach my home's node I am able to create a post.
Wuhuu! Not yet! I do have a few ideas on how to implement that. Since the size of messages is limited to 200 characters, and since trying to transmit too much data via meshtastic wouldn't be very efficient, I am brainstorming about how to implement notifications and fetching in a somewhat compatible manner.
One approach would be via some interface that displays the minimum amount of data (for example, first few letters of a post's title, community, username). The user would "fetch" specific pieces of data, which then gets stored into the phone's memory and this way one can populate the application with content without overloading the mesh.
It's not something I am too seriously considering actually making, I am just having a bit of fun.
6
ErAs:In(Al)GaAs Terahertz Transceivers for Compact Pulsed Free Space Photonic Vector Network Analyzer
(preprints.opticaopen.org)
Abstract
We present ErAs:In(Al)GaAs-based terahertz transceiver modules, comprising transmitter and receiver components integrated on a single chip. The transceiver module is employed in a two-port single-path (TxRx-Rx) or 1.5-port pulsed free space photonic vector network analyzer setup, wherein the second receiver is an individual ErAs:InGaAs photoconductor. This configuration allows for simultaneous extraction of transmission and reflection coefficients or scattering parameters S21 and S11. The system achieves a peak dynamic range of ~59 dB for S21 and ~43 dB for S11 at a bandwidth reaching ~3.5 THz for the transmission and ~2.5 THz for the reflection path. These values are obtained by averaging over 500 traces at a scan rate of 4 Hz. The system exhibits superior frequency coverage compared to commercially available electronic vector network analyzers, thus offering a compact, cost-effective, broadband characterization solution for the benchmarking of terahertz devices and components.
view more: next ›
Doesn't the executive order specify the 'Gulf of America' as the sub-secion of the Gulf of Mexico that is bordering the US states? If so, should't that name appear only when you zoom into that specific sub-region?
I'm from Mexico so my opinion on this whole thing is pretty obvious.